Bora 501060 8" Fine/Coarse Combination Sharpening Store Aluminum Oxide Two Sided Stone for Sharpening Knives, Woodworking Tools and Many Others The coarse 120 grit lighter side is for initial sharpening or removing small nicks and the finer 240 grit dark side is for final honing or touchups Ideal size for bench work Measures 8" x 2" x 1" (203 mm x 50mm x 25mm) Use water or oil as a lubricant Intended for sharpening all types of tools and knives